debugger: replace artificial "{console,log}streamoutput" member in GdbMi

debugger: replace artificial "{console,log}streamoutput" member in GdbMi

Use proper QByteArray member in GdbResponse instead. Less magic, and
does not break array-style reponses where all children are assumed to
be of the same "type".

Change-Id: Ief1efdeb0412f59836e1b2d6f4cb751ddef3216e
Reviewed-on: http://codereview.qt.nokia.com/1184
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>